Limited play data storage media and coating formulations thereon
a technology of data storage media and limited play, applied in the field of storage media, can solve the problems of inability to defeat the technique and the risk of losing intellectual property
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example 1
Preparation of PMMA / Oxidized Leuco Methylene Blue Coating Solution
[0080]A solution of PMMA in 1-methoxy-2-propanol was prepared by adding 111 grams of ELVACITE 2008 poly(methyl methacrylate) (inherent viscosity about 0.183 cm3g−1) available from INEOS ACRYLICS to 450 grams of 1-methoxy-2-propanol in a bottle and rolling on a roller mill to effect dissolution. The resultant solution was transferred to a flask and heated to about 80° C. while a slow stream of about 100 cc / min (cubic centimeters per minute) of nitrogen was passed over the surface of the solution to produced a degassed solution of PMMA in 1-methoxy-2-propanol. This “de-aerated” solution was transferred using nitrogen pressure via cannula to an oxygen free bottle equipped with a rubber septum.
[0081]Methylene blue trihydrate (4.85 grams), camphorsulfonic acid (2.05 grams) and 1-methoxy-2-propanol (148.3 grams) were charged to a 250 milliliter (mL) flask equipped with a rubber septum. The mixture was stirred and heated on ...
example 2
Preparation of a Disc Coated with PMMA / Oxidized Leuco Methylene Blue and Measurement of Disk Reflectivity
[0083]Approximately 3 mL of the PMMA / oxidized leuco methylene blue coating solution prepared in Example 1 was applied as a ring around the inner diameter of a DVD held on a spin coater. After spin coating at 600 revolutions per minute (rpm) for 60 seconds, the coating was tack-free and very blue. Reflectivity of the coated disk was measured using a DR. SHENK PROmeteus instrument, model MT-136E. A number of discs were prepared using the procedure described herein and their reflectivities were measured similarly using the DR. SHENK PROmeteus instrument. The initial average reflectivities ranged from 4.9% to 8.3%.
examples 3 – 6
EXAMPLES 3–6
[0084]Limited-play DVDs were prepared as described in Examples 1 and 2 using the coating formulations shown in Table 1.
[0085]
TABLE 1COATING FORMULATIONSWeight of each component in grams [g]Formulation 1Formulation 2Formulation 3Formulation 4Formulation 5DOWANOL PM82410164164164ELVACITE 200815.2761600PMMAPHS8000320polyhydroxystyrenePHS-co-MMA001600copolymercellulose acetate000032Acetone0000254,4′-biphenol07.6000Methylene blue1.15.492.722.722.72trihydratecamphorsulfonic acid0.552.761.361.361.36Stannous octanoate2.3811.911.7711.7711.77BYK-3010.150.750.300.300.30
[0086]Three samples from each solution were spun-coated onto the surface of DVD discs (3 mL aliquot, 600 rpm, 60 seconds). Initial reflectivities were measured as described in Example 2. Samples were placed in a Xenon WEATHER-O-METER (“WoM”) for 20 hrs. Final reflectivity measurements were taken as described in Example 2. Results were compared to that of the control samples and can be seen in Table 2.
[0087]
TABLE 2% R...
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